CN105330185A - Method for reducing lowest eutectic point of low-heat Portland cement clinker - Google Patents
Method for reducing lowest eutectic point of low-heat Portland cement clinker Download PDFInfo
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- CN105330185A CN105330185A CN201510830883.3A CN201510830883A CN105330185A CN 105330185 A CN105330185 A CN 105330185A CN 201510830883 A CN201510830883 A CN 201510830883A CN 105330185 A CN105330185 A CN 105330185A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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Abstract
The invention relates to a method for reducing the lowest eutectic point of low-heat Portland cement clinker. The method comprises the steps of carrying out mineral solid solution by using the metallic elements in lead and zinc mine tailing, and inducing the crystal lattices of silicate minerals to have distortion so as to reduce the lattice energy of the silicate minerals and the lowest eutectic point of low-heat Portland cement clinker; determining raw material components and the weight ratio of all the raw material components according to the composition of the low-heat cement clinker as well as the three indexes including lime saturation factor, silica modulus and alumina modulus of the low-heat cement clinker; fully mixing the prepared raw material components, and grinding into raw material powder; sintering until the raw material powder is melt, and cooling to obtain the low-heat Portland cement clinker. After the low-heat Portland cement clinker is used, the production cost is lowered, the coal consumption is reduced by 5-10%, the yield per unit time of the low-heat Portland cement clinker is improved by 5-10%, and the lowest eutectic point of the low-heat Portland cement clinker is remarkably reduced.
Description
Technical field
The present invention relates to building material technical field, particularly a kind of method reducing low-heat portland cement clinker aggregate lowest total of the melting point.
Background technology
Traditional silicate cement is one of topmost material of construction.But, because in cement, containing a large amount of high calcium alite, (Alite, symbol is C
3s) mineral, therefore also exist the shortcoming and defect part that some is difficult to overcome.As fast in cement concrete slump loss, workability is poor; Hydration heat is high, and concrete easily produces temperature difference crack; Dry shrinkage is comparatively large, easily produces desciccation crack etc.
In water conservancy project Dam Construction, for preventing the appearance of thermal cracking, require that cement has low hydration heat characteristic.Low-heat portland cement has than ordinary Portland cement, the hydration heat that moderate heat cement is lower, low contract with dry rate and high-durability, the hydraulic large-volume concrete drying shrinkage of preparation is little, High anti bending strength, thermal insulation warming is lower than moderate heat cement concrete 5 ~ 10 DEG C, Comprehensive Crack-Resistance performance is better than moderate heat cement concrete, is the gelling material of preparation hydraulic large-volume concrete first-selection.Be successfully applied to the construction of hydropower plant such as Three Gorges, Shen Xigou, Xi Luodu, Burner zone at present, present good popularizing application prospect.
But low-heat portland cement early strength is on the low side, to the construction speed of concrete works and construction quality unfavorable, hinder its sizable application in water conservancy project Dam Construction.Effective reduction low-heat portland cement clinker aggregate lowest total of the melting point can induce silicate minerals in kiln more fully nucleation, grow up, maintain high reactivity crystal formation, thus part improves cement early strength.
Summary of the invention
Main purpose of the present invention is to reduce low-heat portland cement clinker aggregate lowest total of the melting point, provides high-quality cement.
A kind of method reducing low-heat portland cement clinker aggregate lowest total of the melting point, it is characterized in that: described method utilizes the metallic element in Pb-Zn tailings to carry out mineral admittedly, induction silicate minerals lattice distorts, reduce silicate minerals lattice energy, reduce low-heat portland cement clinker aggregate lowest total of the melting point;
Described metallic element is lead, zinc and copper.It is as follows that described method comprises step:
1) select raw material components according to the lime saturation factor of the composition of low heat cement grog and grog thereof, silicon rate and aluminium rate three rate values and determine the weight proportion of each raw material component;
Described raw material raw material comprises Wingdale, silica, Pb-Zn tailings, iron ore;
Described lime saturation factor 0.78 ~ 0.82; Silicon rate 2.6 ~ 2.8; Aluminium rate 0.68 ~ 0.72;
2) by step 1) in the raw material component for preparing fully mix, grinding becomes raw meal powder;
3) described raw meal powder is burnt to melting, and cool, obtain low-heat portland cement clinker aggregate.
Described step 1) low-heat portland cement clinker aggregate comprises following component by weight:
Tricalcium silicate: 25-50 part; Dicalcium Phosphate (Feed Grade): 30-55 part; Tricalcium aluminate: 0.5-4 part; Tetracalcium aluminoferrite: 10-23 part; Magnesium oxide: 0.5-7 part.
Described step 1) low-heat portland cement clinker aggregate comprises following component by weight:
Tricalcium silicate: 30-40 part; Dicalcium Phosphate (Feed Grade): 40-50 part; Tricalcium aluminate: 1-3 part; Tetracalcium aluminoferrite: 15-18 part; Magnesium oxide: 1-6 part.
Described step 2) in the fineness of raw meal powder be that 80 μm of square hole sieves tail over weight percent≤15%.
The method of lowest total of the melting point detecting low-heat portland cement clinker aggregate is: by step 2) described raw meal powder is placed in image-type sintered point tester and heats up, and time below 850 DEG C, temperature rise rate controls at 50 DEG C/min; More than 850 DEG C, time control is built in 5 DEG C/min; By image-type sintered point tester observation sample, shrinking appears in test, and the reference grid on contrast mirror image, test contraction reaches two lattice, and sample is dark bright shape, namely thinks and reaches lowest total of the melting point.
A kind of method reducing low-heat portland cement clinker aggregate lowest total of the melting point provided by the invention, beneficial effect is as follows:
1, the present invention utilizes the metallic element such as lead, zinc, copper in Pb-Zn tailings to carry out mineral solid solution (ion melts admittedly), induction silicate minerals lattice distorts, reduce silicate minerals lattice energy, thus effectively reduce low-heat portland cement clinker aggregate lowest total of the melting point.
2, the present invention can induce silicate minerals in kiln more fully nucleation, grow up, maintain high reactivity crystal formation, thus improve cement early strength, to make up the shortcoming of low-heat portland cement early strength deficiency, meet the construction speed requirement of hydroelectric project.
3, the low-heat portland cement clinker aggregate adopting present invention process to make can reduce production cost, reduce coal consumption 5%-10%, improve low-heat portland cement clinker aggregate output 5%-10% in unit time, can significantly reduce low-heat portland cement clinker aggregate lowest total of the melting point.
4, the present invention is by the strict fineness controlling raw meal powder, ensures that raw material can fully melting fast, improves the production efficiency of low-heat portland cement clinker aggregate.
Embodiment
Further illustrate the present invention below in conjunction with embodiment, but the scope of protection of present invention is not limited to the scope of embodiment statement.
The present invention carries out low-heat portland cement raw meal proportioning using Pb-Zn tailings as starting material, utilize the metallic element such as lead, zinc, copper wherein to carry out mineral admittedly to melt, induction silicate minerals lattice distorts, reduce silicate minerals lattice energy, thus effectively reduce low-heat portland cement clinker aggregate lowest total of the melting point.
In order to describe method and the feature of this patent in detail, now illustrate as follows.
Embodiment 1
Wingdale, silica, Pb-Zn tailings, iron ore is adopted to be starting material (chemical composition is in tables 1).According to the mineral constituent of the low-heat portland cement clinker aggregate of design in table 2, the lime saturation factor 0.78 of low-heat portland cement clinker aggregate; Silicon rate 2.6; Aluminium rate 0.68, calculate the chemical composition of grog, prepare burden, the result of batching is that raw-meal ingredient is in table 3 with parts by weight.These raw materials are put into together ball mill grinding to 80 μm square hole sieve to tail over the≤raw meal powder of 12%, raw meal powder burns to melting, and cools, and obtains low-heat portland cement clinker aggregate.Be placed in image-type sintered point tester by described raw meal powder and heat up, time below 850 DEG C, temperature rise rate controls at 50 DEG C/min; More than 850 DEG C, time control is built in 5 DEG C/min.Lowest total of the melting point is measured by image-type sintered point tester.
Wingdale, shale, silica, iron ore is adopted to be starting material, with aforesaid method preparation contrast sample.Comparing result is in table 4.
The raw-material chemical composition of table 1 (parts by weight)
| Loss on ignition | SiO 2 | Al 2O 3 | Fe 2O 3 | CaO | MgO | |
| Wingdale | 42.08 | 1.79 | 1.22 | 0.46 | 51.30 | 2.40 |
| Silica | 1.41 | 90.10 | 0.92 | 1.01 | 0.95 | 1.09 |
| Pb-Zn tailings | 10.13 | 40.43 | 23.21 | 20.71 | 1.00 | 0.51 |
| Iron ore | 2.44 | 13.50 | 4.38 | 71.80 | 2.66 | 0.58 |
| Shale | 3.71 | 77.00 | 5.51 | 4.46 | 5.00 | 1.10 |
Table 2 low-heat portland cement design mineral constituent
Table 3 Pb-Zn tailings prepares low-heat portland cement ratio of components 1
Table 4 Pb-Zn tailings and shale are prepared low-heat portland cement lowest total of the melting point and are contrasted 1
| Lowest total of the melting point DEG C | |
| Pb-Zn tailings | 1245 |
| Shale | 1350 |
Embodiment 2
Wingdale, silica, Pb-Zn tailings, iron ore is adopted to be starting material (chemical composition is in tables 1).According to the mineral constituent of the low-heat portland cement clinker aggregate of design in table 2, the lime saturation factor 0.82 of low-heat portland cement clinker aggregate; Silicon rate 2.8; Aluminium rate 0.72, calculate the chemical composition of grog, prepare burden, the result of batching is that raw-meal ingredient is in table 5 with parts by weight.These raw materials are put into together grinding to 80 μm square hole sieve to tail over the≤raw meal powder of 11%.Be placed in image-type sintered point tester by described raw meal powder and heat up, time below 850 DEG C, temperature rise rate controls at 50 DEG C/min; More than 850 DEG C, time control is built in 5 DEG C/min.Lowest total of the melting point is measured by image-type sintered point tester.
Wingdale, shale, silica, iron ore is adopted to be starting material, with aforesaid method preparation contrast sample.Comparing result is in table 6.
Table 5 Pb-Zn tailings prepares low-heat portland cement ratio of components 2
Table 6 Pb-Zn tailings and shale are prepared low-heat portland cement lowest total of the melting point and are contrasted 2
| Lowest total of the melting point DEG C | |
| Pb-Zn tailings | 1240 |
| Shale | 1350 |
Embodiment 3
Wingdale, silica, Pb-Zn tailings, iron ore is adopted to be starting material (chemical composition is in tables 1).According to the mineral constituent of the low-heat portland cement clinker aggregate of design in table 2, the lime saturation factor 0.79 of low-heat portland cement clinker aggregate; Silicon rate 2.7; Aluminium rate 0.69, calculate the chemical composition of grog, prepare burden, the result of batching is that raw-meal ingredient is in table 7 with parts by weight.These raw materials are put into together experiment ball mill grinding to 80 μm square hole sieve to tail over the≤raw meal powder of 10%.Be placed in image-type sintered point tester by described raw meal powder and heat up, time below 850 DEG C, temperature rise rate controls at 50 DEG C/min; More than 850 DEG C, time control is built in 5 DEG C/min.Lowest total of the melting point is measured by image-type sintered point tester.
Wingdale, shale, silica, iron ore is adopted to be starting material, with aforesaid method preparation contrast sample.Comparing result is in table 8.
Table 7 Pb-Zn tailings prepares low-heat portland cement ratio of components 3
Table 8 Pb-Zn tailings and shale are prepared low-heat portland cement lowest total of the melting point and are contrasted 3
| Lowest total of the melting point DEG C | |
| Pb-Zn tailings | 1252 |
| Shale | 1350 |
Embodiment 4
Wingdale, silica, Pb-Zn tailings, iron ore is adopted to be starting material (chemical composition is in tables 1).According to the mineral constituent of the low-heat portland cement clinker aggregate of design in table 2, the lime saturation factor 0.81 of low-heat portland cement clinker aggregate; Silicon rate 2.7; Aluminium rate 0.71, calculate the chemical composition of grog, then prepare burden by spline fit method, the result of batching is that raw-meal ingredient is in table 9 with parts by weight.These raw materials are put into together experiment ball mill grinding to 80 μm square hole sieve to tail over the≤raw meal powder of 10%.Be placed in image-type sintered point tester by described raw meal powder and heat up, time below 850 DEG C, temperature rise rate controls at 50 DEG C/min; More than 850 DEG C, time control is built in 5 DEG C/min.Lowest total of the melting point is measured by image-type sintered point tester.
Wingdale, shale, silica, iron ore is adopted to be starting material, with aforesaid method preparation contrast sample.Comparing result is in table 10.
Table 9 Pb-Zn tailings prepares low-heat portland cement ratio of components 4
Table 10 Pb-Zn tailings and shale are prepared low-heat portland cement lowest total of the melting point and are contrasted 4
| Lowest total of the melting point DEG C | |
| Pb-Zn tailings | 1250 |
| Shale | 1350 |
Embodiment 5
Wingdale, silica, Pb-Zn tailings, iron ore is adopted to be starting material (chemical composition is in tables 1).According to the mineral constituent of the low-heat portland cement clinker aggregate of design in table 2, the lime saturation factor 0.81 of low-heat portland cement clinker aggregate; Silicon rate 2.7; Aluminium rate 0.69, calculate the chemical composition of grog, prepare burden, the result of batching is that raw-meal ingredient is in table 11 with parts by weight.These raw materials are put into together experiment ball mill grinding to 80 μm square hole sieve to tail over the≤raw meal powder of 9%.Be placed in image-type sintered point tester by described raw meal powder and heat up, time below 850 DEG C, temperature rise rate controls at 50 DEG C/min; More than 850 DEG C, time control is built in 5 DEG C/min.Lowest total of the melting point is measured by image-type sintered point tester.
Wingdale, shale, silica, iron ore is adopted to be starting material, with aforesaid method preparation contrast sample.Comparing result is in table 12.
Table 11 Pb-Zn tailings prepares low-heat portland cement ratio of components 5
Table 12 Pb-Zn tailings and shale are prepared low-heat portland cement lowest total of the melting point and are contrasted 5
| Lowest total of the melting point DEG C | |
| Pb-Zn tailings | 1270 |
| Shale | 1350 |
Embodiment 6
Wingdale, silica, Pb-Zn tailings, iron ore is adopted to be starting material (chemical composition is in tables 1).According to the mineral constituent of the low-heat portland cement clinker aggregate of design in table 2, the lime saturation factor 0.79 of low-heat portland cement clinker aggregate; Silicon rate 2.7; Aluminium rate 0.69, calculate the chemical composition of grog, then prepare burden by spline fit method, the result of batching is that raw-meal ingredient is in table 13 with parts by weight.These raw materials are put into together experiment ball mill grinding to 80 μm square hole sieve to tail over the≤raw meal powder of 9%.Be placed in image-type sintered point tester by described raw meal powder and heat up, time below 850 DEG C, temperature rise rate controls at 50 DEG C/min; More than 850 DEG C, time control is built in 5 DEG C/min.Lowest total of the melting point is measured by image-type sintered point tester.
Wingdale, shale, silica, iron ore is adopted to be starting material, with aforesaid method preparation contrast sample.Comparing result is in table 14.
Table 13 Pb-Zn tailings prepares low-heat portland cement ratio of components 6
Table 14 Pb-Zn tailings and shale are prepared low-heat portland cement lowest total of the melting point and are contrasted 6
| Lowest total of the melting point DEG C | |
| Pb-Zn tailings | 1251 |
| Shale | 1350 |
Embodiment 7
Wingdale, silica, Pb-Zn tailings, iron ore is adopted to be starting material (chemical composition is in tables 1).According to the mineral constituent of the low-heat portland cement clinker aggregate of design in table 2, the lime saturation factor 0.81 of low-heat portland cement clinker aggregate; Silicon rate 2.7; Aluminium rate 0.71, calculate the chemical composition of grog, then prepare burden by spline fit method, the result of batching is that raw-meal ingredient is in table 15 with parts by weight.These raw materials are put into together experiment ball mill grinding to 80 μm square hole sieve to tail over the≤raw meal powder of 8%.Be placed in image-type sintered point tester by described raw meal powder and heat up, time below 850 DEG C, temperature rise rate controls at 50 DEG C/min; More than 850 DEG C, time control is built in 5 DEG C/min.Lowest total of the melting point is measured by image-type sintered point tester.
Wingdale, shale, silica, iron ore is adopted to be starting material, with aforesaid method preparation contrast sample.Comparing result is in table 16.
Table 15 Pb-Zn tailings prepares low-heat portland cement ratio of components 7
Table 16 Pb-Zn tailings and shale are prepared low-heat portland cement lowest total of the melting point and are contrasted 7
| Lowest total of the melting point DEG C | |
| Pb-Zn tailings | 1260 |
| Shale | 1350 |
Embodiment 8
Wingdale, silica, Pb-Zn tailings, iron ore is adopted to be starting material (chemical composition is in tables 1).According to the mineral constituent of the low-heat portland cement clinker aggregate of design in table 2, the lime saturation factor 0.79 of low-heat portland cement clinker aggregate; Silicon rate 2.7; Aluminium rate 0.71, calculate the chemical composition of grog, then prepare burden by spline fit method, the result of batching is that raw-meal ingredient is in table 17 with parts by weight.These raw materials are put into together experiment ball mill grinding to 80 μm square hole sieve to tail over the≤raw meal powder of 8%.Be placed in image-type sintered point tester by described raw meal powder and heat up, time below 850 DEG C, temperature rise rate controls at 50 DEG C/min; More than 850 DEG C, time control is built in 5 DEG C/min.Lowest total of the melting point is measured by image-type sintered point tester.
Wingdale, shale, silica, iron ore is adopted to be starting material, with aforesaid method preparation contrast sample.Comparing result is in table 18.
Table 17 Pb-Zn tailings prepares low-heat portland cement ratio of components 8
Table 18 Pb-Zn tailings and shale are prepared low-heat portland cement lowest total of the melting point and are contrasted 8
| Lowest total of the melting point DEG C | |
| Pb-Zn tailings | 1255 |
| Shale | 1350 |
Embodiment 9
Wingdale, silica, Pb-Zn tailings, iron ore is adopted to be starting material (chemical composition is in tables 1).According to the mineral constituent of the low-heat portland cement clinker aggregate of design in table 2, the lime saturation factor 0.79 of low-heat portland cement clinker aggregate; Silicon rate 2.7; Aluminium rate 0.69, calculate the chemical composition of grog, then prepare burden by spline fit method, the result of batching is that raw-meal ingredient is in table 19 with parts by weight.These raw materials are put into together experiment ball mill grinding to 80 μm square hole sieve to tail over the≤raw meal powder of 7%.Be placed in image-type sintered point tester by described raw meal powder and heat up, time below 850 DEG C, temperature rise rate controls at 50 DEG C/min; More than 850 DEG C, time control is built in 5 DEG C/min.Lowest total of the melting point is measured by image-type sintered point tester.
Wingdale, shale, silica, iron ore is adopted to be starting material, with aforesaid method preparation contrast sample.Comparing result is in table 20.
Table 19 Pb-Zn tailings prepares low-heat portland cement ratio of components 9
Table 20 Pb-Zn tailings and shale are prepared low-heat portland cement lowest total of the melting point and are contrasted 9
| Lowest total of the melting point DEG C | |
| Pb-Zn tailings | 1240 |
| Shale | 1350 |
The above embodiments are only the preferred technical solution of the present invention, and should not be considered as restriction of the present invention, and the embodiment in the application and the feature in embodiment, can arbitrary combination mutually when not conflicting.The technical scheme that protection scope of the present invention should be recorded with claim, the equivalents comprising technical characteristic in the technical scheme of claim record is protection domain.Namely the equivalent replacement within the scope of this improves, also within protection scope of the present invention.
Claims (7)
1. one kind is reduced the method for low-heat portland cement clinker aggregate lowest total of the melting point, it is characterized in that: described method utilizes the metallic element in Pb-Zn tailings to carry out mineral solid solution, induction silicate minerals lattice distorts, reduce silicate minerals lattice energy, reduce low-heat portland cement clinker aggregate lowest total of the melting point;
Described metallic element is lead, zinc and copper.
2. method according to claim 1, is characterized in that, comprises the following steps:
1) according to the lime saturation factor of the composition of low heat cement grog and grog thereof, silicon rate and aluminium rate three indexs, the weight proportion of raw material component and each raw material component is determined;
Described raw material raw material comprises Wingdale, silica, Pb-Zn tailings, iron ore;
2) fully mixed by the raw material component prepared in step 1), grinding becomes raw meal powder;
3) by described step 2) raw meal powder burns to melting, and to cool, and obtains low-heat portland cement clinker aggregate.
3. method according to claim 2, is characterized in that: described step 1) low-heat portland cement clinker aggregate comprises following component by weight:
Tricalcium silicate: 25-50 part; Dicalcium Phosphate (Feed Grade): 30-55 part; Tricalcium aluminate: 0.5-4 part; Tetracalcium aluminoferrite: 10-23 part; Magnesium oxide: 0.5-7 part.
4. method according to claim 3, is characterized in that: described step 1) low-heat portland cement clinker aggregate comprises following component by weight:
Tricalcium silicate: 30-40 part; Dicalcium Phosphate (Feed Grade): 40-50 part; Tricalcium aluminate: 1-3 part; Tetracalcium aluminoferrite: 15-18 part; Magnesium oxide: 1-6 part.
5. method according to claim 2, is characterized in that: the lime saturation factor of described step 1) grog is 0.78 ~ 0.82; Silicon rate is 2.6 ~ 2.8; Aluminium rate is 0.68 ~ 0.72.
6. method according to claim 2, is characterized in that: described step 2) in the fineness of raw meal powder be that 80 μm of square hole sieves tail over weight percent≤15%.
7. method according to claim 2, it is characterized in that, the method of lowest total of the melting point detecting low-heat portland cement clinker aggregate is: by step 2) described raw meal powder is placed in image-type sintered point tester and heats up, and time below 850 DEG C, temperature rise rate controls at 50 DEG C/min; More than 850 DEG C, time control is built in 5 DEG C/min; By image-type sintered point tester observation sample, shrinking appears in test, and the reference grid on contrast mirror image, test contraction reaches two lattice, and sample is dark bright shape, namely reaches lowest total of the melting point.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110615627A (en) * | 2019-09-02 | 2019-12-27 | 中国建筑材料科学研究总院有限公司 | Early-strength low-heat cement for railway engineering and preparation method thereof |
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| US5968258A (en) * | 1995-06-26 | 1999-10-19 | Fenicem Minerals Inc. | Method of making cement from base metal smelter slag |
| CN1657467A (en) * | 2005-01-24 | 2005-08-24 | 浙江大学 | Process for calcining cement clinker using energy ore characteristics in apper, lead zinc tail ore |
| CN101723606A (en) * | 2009-12-11 | 2010-06-09 | 四川嘉华企业（集团）股份有限公司 | Cement clinker and hydraulic engineering cement for impervious wall of dam and application thereof |
| CN104355558A (en) * | 2014-10-28 | 2015-02-18 | 中南大学 | Cement employing lead-zinc tailings as raw material and preparation method of cement |
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| US5968258A (en) * | 1995-06-26 | 1999-10-19 | Fenicem Minerals Inc. | Method of making cement from base metal smelter slag |
| CN1193613A (en) * | 1998-03-02 | 1998-09-23 | 中国建筑材料科学研究院 | Cement clinker and preparation thereof |
| CN1657467A (en) * | 2005-01-24 | 2005-08-24 | 浙江大学 | Process for calcining cement clinker using energy ore characteristics in apper, lead zinc tail ore |
| CN101723606A (en) * | 2009-12-11 | 2010-06-09 | 四川嘉华企业（集团）股份有限公司 | Cement clinker and hydraulic engineering cement for impervious wall of dam and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110615627A (en) * | 2019-09-02 | 2019-12-27 | 中国建筑材料科学研究总院有限公司 | Early-strength low-heat cement for railway engineering and preparation method thereof |
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